NEW YORK -- Lockheed Martin Chairman and Chief Executive Officer Vance Coffman today told Wall Street investors that current discussions within the Pentagon over the eventual size of the Joint Strike Fighter fleet would have little long-term impact on the program or his company. "The size of the marketplace the Joint Strike Fighter will play into is going to be over 30 or 40 years," Coffman said at an aerospace and defense finance conference here. "One administration will not determine...